Number
129
129 is a composite number, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 12
- Digital root
- 3
- Palindrome
- No
- Divisor count
- 4
- σ(n) — sum of divisors
- 176
Primality
Prime factorization: 3 × 43
Divisors & multiples
Aliquot sum (sum of proper divisors):
47
Representations
- In words
- one hundred twenty-nine
- Ordinal
- 129th
- Roman numeral
- CXXIX
- Binary
- 10000001
- Octal
- 201
- Hexadecimal
- 81
Also seen as
Unicode codepoint
U+0081
Control character (Cc)
UTF-8 encoding: C2 81 (2 bytes).
Hex color
#000081
RGB(0, 0, 129)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.129.